Some Pittsburghers in the city's Lincoln Place neighborhood are complaining they haven't received their sewage bills in the mail for months and they say they worry what will happen when their accumulating bills do arrive.

Friends Mary Dulya and Chris Soulier say that while they are still getting and paying their Pennsylvania American Water bills, they haven't gotten a sewage bill from the Pittsburgh Water and Sewer Authority since April.

Their concern?

"Not getting a bill, then getting zapped with a bigger bill when it finally does start to kick in again," Soulier said.

The problem is nobody has received it and we've been waiting and waiting, and all the neighbors are asking, 'Did you get, it did you get it?' And we haven't got it," Dulya said.

Water Authority spokeswoman Melissa Rubin declined to speak on camera with Pittsburgh's Action News 4, but offered an explanation.

Rubin said that in January, the Authority and Pennsylvania American Water each converted to new software, and that the new systems don't communicate with each other. Rubin said the Authority has identified a software solution to the problem which should be in place by July 31. Updated bills would then be sent in August. Rubin said affected customers would not be charged late fees. She said those who with concerns about making payments should contact the Authority's customer service.

"I'm on a fixed income and I can't afford for a bill to get too high or I have problems," Soulier said.

"What is my bill now? They can't tell me. They're telling me I can send money in and make that bill go down. I'm not sending them money if they don't know how much I owe them," Dulya said.

Pennsylvania American Water response differs from that of the Pittsburgh Water and Sewer Authority.

"Pennsylvania American Water is surprised to only learn now through the news media about alleged usage data transfer issues that have prevented PWSA from properly billing their customers during the past several months. Our customer service team will be reaching out to PWSA early next week to discuss and address any issues with the data transfer process," said PAW spokesman Gary Lobaugh.

The spokesman says the utility reviewed its records in response to the questions raised by Pittsburgh's Action News 4.

"Pennsylvania American Water has no record of any issues being brought to our attention recently related to the transfer of water usage data to PWSA, or any of the approximately 170 communities across the Commonwealth with whom we partner to provide this information on a daily, weekly, or monthly basis," Lobaugh said.

He also differed with the timeline provided by the Pittsburgh Water and Sewer Authority.

"Pennsylvania American Water converted to the 'new' software in October of 2013," wrote Lobaugh in an email. "Prior to the conversion, all 170 communities (including PWSA) participated in online training to adapt to the new usage data file layout. PWSA was responsible for updating their software prior to October of 2013, which was explained during aforementioned online training."